We took Diaper Safari and Grovia covers on a flats-only trip with our slim (then) 14mo old. My DH and I both FAR preferred Grovia (admittedly, we often use them at home with snap-ins so we're more familiar with them). A few things I didn't care for about Diaper Safari:

-since they will fit a big baby well, it seemed like there was lots of extra fabric that needed to be wrapped around our guy's hips

-three snaps per side is too much when LO flips over and crawls away mid-change (though some may prefer having a hip snap to avoid wing droop; we don't get droop on our Grovia covers thanks to the in-line snap configuration)

-the back flap comes so low that poop got on it every time and the knit is not wipeable

-lots of exposed PUL

Grovia don't have flaps, but the mesh prevents the flat from shifting. The crotch is on the narrow side, which I like for my guy, but that means you need to make sure everything is fully "tucked in" if using a larger flat like Blueberry. I think if you were using a slightly smaller flat this wouldn't be an issue.

Thanks. The extra fabric is a big problem for us. My little guy is 10 months old and in the 15% for weight and 60% for height. He is just sooo darn skinny.

The fit makes all the difference. It's hard to say what will work for every baby Hopefully you'll find something you love! If you try Capri I'd recommend trying a size 1 for that small a kid. I can fit the size 2 on the smallest rise on my DD over a trim flat. Though she does have a short rise.